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Might be worth reading through the Tolerances sticky and checking all the tolerances such as sear rod length, on/off pin length, plunger rod length etc. And as mentioned above, just because it will trigger the solenoid it doesnt mean the battery is good. Whats the output when its fully charged?

If you don't have a voltmeter, you can take it to somewhere like Batteries PLus and they can test the pack for you and rebuild it if necessary. If the battery is more than 4-5 years old and been used, it's more than likely shot.

Ok, first thing is when you pull the trigger is the pin out or can you pull the trigger all the way back flush? And most common thing of it not firing in mech or elec mode is......did you turn off your saftey? Noob mistake....I learned.